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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aeb426005f0ee05a7e3f62fcc8b1163de749510ef37c55f3a29f04eb860a485' 
  AND token = 'XgP5gWJH/S98/e3NGDKb6Ph3zfQmz2clDuLnLY42PF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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