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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36a8d03a91a106033aee9359cfa31bc6da77d1d1f9a05f638a835af57d1a47ec' 
  AND token = 'AGp12Dn/azY5pyQCP5zKBpR4D4JHKOLB7al622kVeoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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