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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e64841dafb5923ccf46ef65528c2e149690d792849bac56b55676d575e122fe' 
  AND token = 'gw3/KWcSK5aP8FHS41W5OMp0zAuMu27JmQ6IPc45vKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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