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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be7be1466dd227221bfe45835f175468259301a0af5feca5fd0b8c60cc32965a' 
  AND token = 'nlrkDSX6bH/2BjiRPWdAIsoa5sshxEPmoWWv/j7jod0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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