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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5e7e5b84c60ea8f023c181e5232aaae7ee455b0eaaebf21f884c715e6288268' 
  AND token = '059NR5WVpvyK42yFwCD3hf5LqN3L038zzadomaKrvLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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