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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e9494ac826140a3f949967d55c92637465cff25375d13701605876e144a4bb2' 
  AND token = 'GeOTkkKEQwPDwCwuWbJ8CuVzzrJ5rdZNMtuIb0W1+3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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