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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96a27177a1f91eb3f52596960b121de730d3fec3d2e41271beff6735f516e941' 
  AND token = 'eHqLIwUStsiUf5sO5fb/0AKG01gixVCOIME3/xG5cao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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