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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8438efe1f8fd7a3d8d9e9784228f11ab0ce4e483089b3050bbba519fc8373ee0' 
  AND token = '/VQ4gGYQcsk5J88BinEwFDIjpwr0LF0XlN1PnVoX2js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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