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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63cee00210e737fe45141d27dc101e55f5b78a9a20476ee1df29aa9c2d61d4ac' 
  AND token = 'Vp1IB11eUfezAup7n4Ip89YaBEuZ2QcdyHGtHpGAuoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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