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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bee0be4d358c20575afa3730073a732a8f69ca37cd7cedb5d823c76d69a1e10' 
  AND token = 'SzZpPue8nPVRXAnVF7EGtXyw8j8UrUsjSpbhmP5HwCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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