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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7be89db50db2de0c689aca476bc7c0f3eff93c1e94d5a5330a0b7a08a187226c' 
  AND token = '6daDLtOVreJrN0es36nH0x4bLP9RCDbjEMh86mkBMmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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