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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba5c890ab694a8dce138289a8c43fed40467a19ce6e2f657ac4533beb1d47781' 
  AND token = 'yccyph9MwXr8Vs4yf57xi8dmCMI+x9DGPrZDmVVwhaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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