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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd6357350080223bc7a18bafb6e8df98f0c81c1d69f4c17a5387ab1ac07e8c2e' 
  AND token = 'B4u0Dp+2H7jFyNwfGsCow4DDdu7furQMNN8PluW+vCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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