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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37cb02f2c628394b35aea8a29da10d555028ae6e0da88aabda187ef0f3a25392' 
  AND token = 'Y3LC0RGHgZh+5a7qIc4/1seK+Iu5qGZBw/ngcRTFtDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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