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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37a913ec79cad7aa2e082d1818fec9fcd1161163d685fdb6edf09d8762ac6942' 
  AND token = 'sOExARF8Na8c0QTSa/8xFGlLFdI8xiPiT79pP104Tj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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