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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d32c82ff18cf18a67d1d83fc44d8e5bd3eca5a5bd1a590c237d6e5c4a218b4a' 
  AND token = 'eYeXMsJDDVRTK583heGFxYfOy2KJfJSN8+sIgD0/6aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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