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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcfcf6364fea516c7d894314a6f909915c74e211839594d97144032fe2d4e289' 
  AND token = 'BBIdwSPL1ZnnKIeh11lxdXq2UlOT6xj6GA4cRRJE0s0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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