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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9852ef89433f6622237fb6ecbcdb2264629af27c7e96c758fd2147a27287624' 
  AND token = 'UMm8DFRF4Pcr1a7CTwHwaCmm2YMSSNs2M3KsTwD8JyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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