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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f86fc5fb295d898a933c87bf238c44115a2a5cd42fd2581e8d375cd2ad4f816a' 
  AND token = 'YEparoDr1l2U6TYhxaLaf0r8Xk1XXuPNM4iIPz470JY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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