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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76181e43a4e81a9a76aaf67f1bfa86b799b3cca73744029a3c43f5db55ad79da' 
  AND token = 'W5fUDmCKDENK6uQJ+/oihTjBUdg39bj8QD7HFQ447vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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