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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d7c59c3de646c3fb38a80e13e18ba77670ef34fe10d1db69ac4fde2b7a8c6c1' 
  AND token = 'diLODXJliTWAP+uOO0quEN3UgpDQRcZbrmFNaXxD4Ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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