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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9668b28331c282ff40838109f72cdd1b605d51c6eb8a6fe343d4cad48312d67d' 
  AND token = 'm9K6ftAv9HAjFoIsb3ychuN2k1gHJsSsP1gdzqGGjU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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