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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd649b3cbe640fb98ac242ee830233506dfb3c63e67009b2dca2cce67a15c4ff' 
  AND token = 'FdXjcjl/Jdr/2ngVaUkYL1eZvT5BoSRPr0I8XIE7/nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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