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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed4ce60ac100761ad5f9d6f50d5142d26ce0dca12cd46d2d2ff0b0f13dcab7c3' 
  AND token = 'iufX77BfDx8iHzQqLd8io9wpDN49ElljavId6BPiekQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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