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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2156401d43e0ad498128641d90fc34f491e04f0f56ba6aef76b7811b736f7ad' 
  AND token = 'HSZ8K0FjgyZE7Rkm8DcZ6w7xnAeJ4u2SD7JLMdYaDBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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