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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ed8ed28a6f79abfda9486be0c0ff151369eb17026071551a5ca801e313eed26' 
  AND token = 'UcmFlmcYpk+VMQhN9cl62sP5pkAA6oKEqtoNTyrfkG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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