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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0183e9cdbe69169c50a58b3f5ba9070a8a2519233dfaeba2f1966b0a991732d7' 
  AND token = '1cfFAKsd52pSd1vyrpR0Td0HmXMMsPhffS+enUUVsKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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