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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3eea8717f0bfefc7aa98c12a7f98bafbe937ea4befc47bbadc95e950df891b3' 
  AND token = 'aooQQypLLp2FbyO/tXN5j73a+QZWgsC81jhZ/S2uHAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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