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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4789666fa1e3dd59ff72c60845076b1fbc08ba3ccf7f42c642a0ae0dedc30c25' 
  AND token = 'tAfBLJE4d5OYQYPQGsQns00ib0jm7rrxAjP+jtkUIfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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