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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '174fa7aca699e3eec89b85ad82136e7a3e382ed6689e5ac79c7e23ef047e9b28' 
  AND token = 'av9WGE44EPEW38Slc8HXIuDzcHn+9Fzm8s+9wPOZr08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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