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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b9230025a80809f23ee29af901b095515215bf3e76833daeb764a043228fa4b' 
  AND token = '+Sq5rvPm+s7fXS0F11sNjgOA29y2naIT8XbJa6qvZ3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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