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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2e8206f609f2ba8c43ccf4d57e212edacdec39bff672237277bf6af3e1281df' 
  AND token = 'wupR76DYx3Nfn9y2cHp3ojZOQgidD0px4QVaYo/SmYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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