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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '342f0a42e7702554adbcbcd267f3b0c2a8177fb3acdfff2612ef5d0721ba4d6a' 
  AND token = 'sI7SRJsUTne//lzvPr6DxmDi+NbEns8v4HMzply+vlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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