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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1765a2077c3f27caa1c809fe1c2a69b3fb4c9d57f3b1e349bdffbe407e6b0065' 
  AND token = 'ZKmAXHy0GFCLF2gULK13rBL5S4yqvdqLfLkYBl7Go7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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