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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '226c7c308645d8c719756e849c223a59b88213ea4ca391fb39b925a66a1e9cc1' 
  AND token = 'EP4CkriDLH0RPkUPqnxUNqCRSWAB1yOujK1hl88RrWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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