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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a38ff615024f2c47a91eae5627d60e13dae2ddbd52f29b30cf1db144f93aff40' 
  AND token = 'KcdHD97DwngYjZCNRXS/zToNDgAShdgE4Z/2cPbn87I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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