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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80983eaa7b9ea00c8d6092e2c9ac9d9ed6889f2c0cd8631c49904f46e2371673' 
  AND token = 'iRf5W7zaA2YTm0LWDUK1arHeBOvbucYOdRK/bXkAD5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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