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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03067085420bac852627cf76e08fca1786b93d7d37b14e0b74e9b9432832f7ee' 
  AND token = '0kR1IrZ/FLeSfbGN5klAvldNcNoOudKwc0zlV4KtQok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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