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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '581e91a0e8b736679b51fd2ec69d8dc49a2a69c7c885e18f3df57f604d37ddf4' 
  AND token = 'A9SbG7yovzCG/aOJIKobnJ9g8hM8d+1u9LegrvIsFcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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