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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d79b83dbbf08185bd9904a65220960f8a7f76a59fe9aeddd6bbaad310567bea' 
  AND token = 'rV+NeKY0fUsdZ3Q+E9GjcwXH+07jW62GMC09OexegIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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