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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2534a7657c1123d62442c61e267f7b2f3b4a851c7d5720a769205fd1f66e2e76' 
  AND token = '3Ou5+k+5Dq+sHAJuwcfl2GoQLOSCUahnFt7E96wiJxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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