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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd01787f13beefe4391509ab9e2ec39fac9db6a694242f4c9236c4f3946ab40b1' 
  AND token = 'cJnNT7AsZ01aHmCZm6zAaVFQ5eZeXwIdP+mNmlpCzfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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