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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bedca45f91243db55d5f4e5b6a567d636e1defa79cc0e62173f67b652b5ecf1' 
  AND token = 'C39Y5zwV0I/zf29bhUDcpMmpl+ptXXkTr+ZpVClOHcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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