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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3818a3cbe2e91a7e49a3e5c884866c66f6a80439f6eddef614e982d87935c82e' 
  AND token = 'ZuyWsrOJFABEDjacnQL6L2BlTR/KV50sad5kho2adeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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