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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6beefc2187636bbc1c31a8e8913904a0b05a18f1c144f728ec335ac1e52cfdd' 
  AND token = 'lTiO9yhLk8WsuS+KelF39YD/7Im/xDVglKe+44HO0Qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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