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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b8b0a0f58850b0fcb34d6261bd558d59af18b96f311cf3df2635367af5e8928' 
  AND token = 'BFFiJzuMcEfoy+obp9VOC9sFINrZD5C/RNE5jhtGYLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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