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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e19f0316dd0103430a3919f369cce12fa04cb8d6b5ff8cd4f8bdf72182e754f' 
  AND token = 'kM/s9Seu6510deNP4XYNB2M5ijZPSztt65x7StxVIBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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