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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b7cdbb0843a8d08f7078ab7e8489adaf19fd41a53cde2264df7647fae359468' 
  AND token = 'nnC9XMtkMBqKAUMP1mzYru9VJgRTwg1k/t49MYLCn7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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