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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdfbc97439d7c23fbd302579ca3a0dc64eea3f220b2add7a0d7f7f1efc0e624b' 
  AND token = 'Oc0GZ7/9WeIKX2GYKl+s7ivFf38k+AKWFDnqKfo6PH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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