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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f15096252caaa1d9c0a2b134f77f0636a80c95f1fd0f5a38d0bc2b58f1512aed' 
  AND token = '6Su2rmp1gSo9u6dK5C8e7ce4btgFfBasF6jz2yyCpxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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