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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09d8a230a206b2751c15d115dcc31bf97bee136e823d9bceb4e3265be0b426b2' 
  AND token = '7c4QIIz244Au5O4gRXJkCYFmcZMoyMwh/k563QJtM8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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