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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a91ea859bc694e01c9d47281c4718e3041d8832a7a38bd4c2bdb4265bd51b0bf' 
  AND token = 'ItkGiiJa58aQ1l7TV5AQQ0Tga8jQWVTMk25sC6RLPUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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