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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3cee39964c8ba81b459a589e35125c1e2140366f95899ae87c1b8f4174c5468' 
  AND token = 'WJAB9KIB2KDSeG+l/QDACd5GKXNRj6AR5nAdllx1NKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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