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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd076bdda2c12811ce8b8b97f575d3b6a198b79c9b1a00fb8eb09199f4e9068ba' 
  AND token = '7sQnN0xX7kh0S9NwbwJP6BofmL0F88brv8tOswG1B+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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