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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a492f988cc636edad08fdf4366810bca0a19ee49a11740a06dc8c9a46d13911d' 
  AND token = 'E4+Fl3rzBr5/xXe4ZwjEy2E8qDtOyLWcuagfp5Fh97A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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