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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa9424045d0ce663a826c92e03a6ebcd5e4608a6bea8a78c62b59f8ae9b2ff17' 
  AND token = 'cqswgS7+3scVuUuJ2bc4b9d86Xp/mp69ZhTFuanHzUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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