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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '947d54fa0045b157825b20f5071bc2fb02275da932fa4803d5e641c49c797883' 
  AND token = '0aTGDccOo4FKfD8ZBvPJ1H3GZpv/KLjAfXWqG3Zaz4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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