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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62480caf756aa3c4b8ba4689e215b40a2c0eaf2ef14ec2c407626b9ac893309c' 
  AND token = 'Iq4k/LJPqQgrogC9aFhTKpS2jvIFXYT1k07lgOOUa4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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