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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b699d0eccf0466e2560913f8de59a3f6935d3966d2e7027f2882c0c82c59d09' 
  AND token = 'zyY4Tnkc39wvEBH0pm8eKNqOkiyd9q8qGeR7v3fiPhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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