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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '512bc11bb98ba08e86c20ef24f2169ad54d141e629e7b4a26b0f0a0e588451ae' 
  AND token = '1mWFeeR3xDAT8rMiKvm+zTgl1r9/A6ZO3vI/YczdB24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}